The present invention relates to an unmanned aerial vehicle (UAV) 10 for application of an active ingredient to agricultural crops. The UAV comprises at least one liquid reservoir 20, at least one liquid application unit 30, a processing unit 40, at least one set of rotor blades 50, and a plurality of legs 60. The liquid reservoir is configured to hold a liquid comprising the active ingredient. The at least one liquid application unit is in fluid communication with the at least one liquid reservoir. The at least one liquid application unit is configured to receive at least one input from the processing unit. The at least one input is useable to activate the at least one liquid application unit. The unmanned aerial vehicle is configured to fly within an environment using the at least one set of rotor blades. The unmanned aerial vehicle is configured to land within the environment. The unmanned aerial vehicle is configured to walk on the plurality of legs to a location to apply the liquid to at least one plant. The location to apply the liquid is determined based on image analysis of one or more image of at least one image of the environment.
